预激综合征预激合并心房颤动是有致命危险的心律失常,有时心电图酷似室性心动过速,因此有其特别重要的临床意义。预激患者阵发性房颤的发生率虽次于房室折返性心动过速,但 Campbell 报道发生率高达32％,占预激患者快速型心律失常的11.5％—39％,是预激患者常见的心律失常之一。一、房颤发生的机理实验证实预激患者的阵发性房颤与房室旁道密切相关。房颤中很大一部分(16％～26％)是直接由房室折返性心动过速转化而来。房室折返性心动过速时,连续快速的心房活动造成心房扩张、缺氧、易损期扩大,因而诱发房颤。另一些则是由单次房性早搏或室性早搏通过旁道逆传至心房恰好落在心房易损期而导致房颤发作。在房颤的发作和维持中心房内传导延迟起着重要作用。无房内传导延迟者常只有单纯房 Wolff-Parkinson-White syndrome with pre-excitation and atrial fibrillation is a fatal risk of arrhythmia, and sometimes electrocardiogram resembles ventricular tachycardia, so it has a particularly important clinical significance. Although the incidence of paroxysmal atrial fibrillation in pre-excitation patients is inferior to atrioventricular reentrant tachycardia, the incidence of paroxysmal atrioventricular reentrant tachycardia is as high as 32%, accounting for 11.5% -39% of the patients with pre-excitation tachyarrhythmia, One of the common arrhythmias. First, the mechanism of atrial fibrillation experiments confirmed that pre-excitation patients with paroxysmal atrial fibrillation is closely related with atrioventricular bypass. A large proportion of atrial fibrillation (16% to 26%) is directly converted from atrioventricular reentrant tachycardia. Atrioventricular reentrant tachycardia, continuous rapid atrial activity caused by atrial expansion, hypoxia, increased vulnerability, which induced atrial fibrillation. Others are caused by atrial premature beats or premature ventricular contractions by retrograde access to the atria just right in the atrial vulnerable to lead to atrial fibrillation. The onset of atrial fibrillation and to maintain the central atrial conduction delay plays an important role. No room conduction delay often only simple room